Control method and control device of LLC resonant converter

The embodiment of the invention provides a control method and a control device for an LLC resonant converter. The control method comprises the following steps: acquiring an output voltage and system total disturbance of the LLC resonant converter; based on the third-order linear expansion state observer, a reduced-order linear expansion state observer is generated, and the reduced-order linear expansion state observer is used for receiving the output voltage and the total disturbance of the system and transmitting the output voltage and the total disturbance of the system to a variable gain controller, so that the variable gain controller controls the LLC resonant converter. According to the embodiment of the invention, the voltage regulation calculation process is simplified, the voltage regulation time is shortened, the method is simple and effective, disturbance can be effectively suppressed, and the control method has better robustness and dynamic response speed. 本申请实施例提供了一种LLC谐振变换器的控制方法以及控制装置，其控制方法包括：采集L